Elevator control system



Oct. 17, 1933; w. F. EAMES 1,930,512

. ELEVATOR CONTROL SYSTEM Filed on. 11.1929 4Sheets-Sheet 1 INVENTORAT'TORNEY Oct. 17, 1933- w EAMES 1,930,512

ELEVATOR CONTROL SYSTEM Filed Oct: 11, 1929 4 Sheets-Sheet 2 L/ 4? IlNvENTo R f1 gfZ. MY/[am/T'E'ames.

AT'TORNEY Oct. 17, 1933. EAMES 1,930,512

' ELEVATOR CONTROL SYSTEM I Filed Oct. 11, 1929 4 Sheets-Sheet 3INVENTOR F7? 3 Mll/bmFE ames.

A'TTORNEY Oct. 17, 1933. w E EAM'ES I 1,930,512

ELEVATQR CONTROL SYSTEM Filed Oct. 11. 1929 4 Sheets-Sheet 4 F297INVENTOR MflllbmFEamw I B I ATTORNEY Patented Oct. '17, 3

UNITED STA 1,9so,512 I ELEVATOR oo s'rnor. srs'rmm William F. Eames,Edgewood, Pat, asslgnor to Westinghouse Electric & ManufacturingCompany, a corporation of- Pennsylvania Application October 11, 1929.'SerlalNo. 898.941

12 Claims. (cl. 1875-29) My invention relates to control systems 101'elevators and more particularly to control'systems in which the elevatorcars are started by car switches and are stopped by the operation ofpush buttons in the cars or at the landings. jOne object of my inventionis to provide for maintaining a control pushcbutton in its de pressedposition. after" it has been operated, until a car hasstarted to answerthe call, tov thereby indicate that the button has been depressedtoafter they are depressed, so that passengers at .A further object ofmy invention is to providea fully-selective elevator-control system;that is, a system in which a registered call will be canof apparatusthat are usually required in elevoter-control systems or theabove-designated character.

It is also an object of my invention to provide an elevator controlsystem in which. the car may be operated at express speed but be auto--cel1ed the instant-that a car starts to answer for reducing the wiringand the number of pieces matically reduced from its express speed. toitsf normal working speed as it approaches a landing for which a stopcall has been registered. so thatit may arrive within the stopping zoneat such speed as to come to rest exactly level with the.

floor landing.

Other objects or the more. wiilpin pigs,

obvious and will, in part, appear hereinadter.

reference may he. hadto the following descrip For a compieteunderstanding of the invention...

tion, taken in connection with the accompanyingdrawings, in which;

Figures 1, 2, ii and 4 collectively constitutes diagrammaticrepresentation of the controi'cir cuits and apparatus embodying myinvention; as

applied to an elevator system.

The drawings illustrate a pair of elevator cars.

A and B as suitably suspended by cablesCa and Co which pass over the 'Dand' b' f ant thereon.

to suitable counterweights ow and cw, reg spectively. g

- Inasmuch as the control systems for the cars A and B are alike, onlythe control system for car A will'be described. 69

The hoisting drum D for the car A isdirectly coupled to an armature EM'-0! an elevator motor EM, the field winding EMF of which is con-5 nected,for constant-voltage energiz'ation, toa' source oipower-designated astors L1 and L2. i

A- variable-voltage system of control-may be provided for operating thehoisting motor EM wherein the armature EM isconnected in loop circuitwith the armature G 01' a generatorG; 70;: The generator G is providedwith a separatelyv excited field winding GF and a cumulative seriesfield winding GSF. v p

The armature G 01' the generator G is suit ably driven by means of adriving motor M illustrated as being of the shunt-wound type having itsarmature M and. its field winding M1! 7 connected, in shunt relation tothe supply conductors L1 and- L2.

The direction and speed of the hoisting motor EM may be suitablycontrolled by controlling the direction and value of the elicitationcurrent that is supplied to the separately excited field winding'GF ofthef'generator G.

4 The direction of the excitation current-for the field winding; GE maybe suitably controlled by means of an lip-direction switch 1 and wdown-direction switch 2', while the value of the current supplied to thefield winding may be controlled by means of an intermediate-speed relayii, a normal orhigh-s peed relay 4 and an express relay 6. The operationofthe up -direction and down direction switches 1. and 2, as well as theinter mediate-speed relay 3 and the normal highspeed relays may becontrolled by means 'of a car sw'ii'leh'ififilt that is mounted upon;the car A in position to be actuated by 'an attend- An express-speedswitch Si is provided forcon trollling the express-speed relay- 5. Theswitch;

emery be disposed at any suitable point where' a "dispatcher" in chargeof the elevators may close theswitch to speed up the operation of-f thecar-Ant any time desired. For instancel"ii the high speed, that is, thenormal working? speed of the car. is, say, 700 teet'per minute the:dispatcher" may cause it to operate" at an express speed 0!, say, 800feet per minute.

the supply conduc- 65 I A w h? B is connected in'the elevator controlsystem in such manner that it will deenergize the express-speed relay 5to decelerate the car rom express speed to high speed; that is, itsnormal working speed, when the car nears a landing at which it will bestopped by a registered call.

A relay 7 is connected across the loop circuit of the motor EM and isprovided with contact members that open or close gaps in the energizedcircuits for the high-speed relay 4 and the express-speed relay 5, inaccordance with the voltage of the generator G, thereby delaying theenergization of the relays 4 and 5 until the generator voltage reaches apredetermined value and thus preventing the car from being operated in ajerky manner.

Any suitable means may be employed which will, when energized,automatically stop the car A level with the floors past which it moves.In the present instance, I have illustrated the stopping means asincluding an automatic inductor landing system, such as is disclosed inthe copending application of E. M. Bouton, Serial No. 731,921, filed-August 14, 1924 and assigned to the Westinghouse Electric &-Manufacturing Comm y- -The inductor landing system for the car Aincludes an up-high-spee'd inductor relay HU,

and up-intermediate-speed inductor relay SU and a stopping inductorrelay S for causing the car to be automatically decelerated from itshigh and intermediate speeds, respectively, and brought to a stop at anexact level with a floor when the caris travelling upwardly. Similarly,d'own-high-speed inductor relay HD, a downintermediate-speed inductorrelay SD and the stopping inductor relay S will cause the car to slowdown and stop at the floors when it is travelling downwardly.- i

It is assumed that each of the floors past which the car A moves will beprovided with a set of inductor plates that will cooperate with theinductor relays as the car approaches predetermined points in advance ofthe floor atv which a stop is tobe made to effect the operation of therelays.

'I'he inductor plates associated with any one floor for the car A areillustrated'as comprising an up-high-speed inductor plate HU', anup-intermediate-speed inductor plate SU and a stop- .pi'ng inductor plate Sfor successively operating the rip-inductor relays HU, SU and S as thecar makes an up stop. When the car is travelling-downwardly, ahigh-speed inductor plate HD', an intermediate-speed inductor plate SDand a stopping'inductor plate S will successivelyoperate the inductorrelays HD, SD and S, respectively, as the car approaches a down stop.

In the elevator system illustrated in the drawings, the energization ofthe inductor relays on each car for stopping that\' car is effected by acontrol relay that is operated by a plurality of associated floorrelays. Thus, the stopping of the car may be controlled by the floorrelays.

The floor relays, in turn, are controlled by push,

buttons in the cars and at the floor landings. With this arrangement ofapparatus, the operation 01 a push button at a floor landing will causea car running in a corresponding direction to stop at that landing,while the operation of a'push button in a car will cause that car tostop at the landing represented by that push, button.

Inasmuch as the present system is of the high-' speed type in which thenormal slow-down dis tance of the cars is greater than the distancebetween two adjacent floors, two pairs of floor relays are-"provided foreach car, one pair for operating the control relay when the car is to bedecelerated from its normal high speed to a stop at a landing more thanone floor away and the other pair for energizing the controller relaywhen the caris standing at one floor and is to make a stop at the nextfloor.

As shown, the control relay for the car A is RI=is energized by the pushbuttons in car A when the car is to be decelerated from high speed to astop at a floor.-

R2=is energized by the floor push buttons when the car is to bedecelerated from high speed to a stop at a floor.

Gl=is energized by the push buttons in car A when a one-floor run is tobe made.

G2=is energized by the floor push buttons when a one-floor run is to bemade.

The push buttons disposed in the car A to be operated by the carattendant when he desires to register or set up calls that will causethe car to stop at the floors where passengers desire to get off, aredesignated as A.--2, A-3 and A8.

Similar push buttons B-2, B3 and B8 are disposed in the car B to enablethe attendant in that car to stop at any landing to dischargepassengers.

, The push buttons disposed at the floor landings to enable waitingpassengers to register or set up calls that will cause the first car toapproach in a corresponding direction to stop thereat so that they mayboard it are designated as follows:

The up and the down buttons for the second floor are respectivelynumbered 2U and 2-D while those for the third and eighth floors aredesignated as 3-U and 3-D and BU and 8.D.

For the purpose of signalling a passenger wait ing at a floorlandingthat a car approaching in the direction in which he desires to go willmake a stop at his landing, each car is electrically connected toindicating devices, preferably electric lamps, which are mounted outsideof the elevator shafts at the floor landings. Each of the top and bottomfloors is provided with a single lamp or floor lantern for each car,while each of the intermediate floors is provided with a pair oflanterns for each car, one serving to indicate that the correspondingcar is approaching in a downward direction and the other in an upwarddirection. The floor lanterns for the car A are The floor lanterns forthe car B are desig- I emplate in maritime with the son oils of the carswith respectto'the associated floors, the

car Ais provided witlia floor selector FS and thecar" B'with a floorselector BFS. The floor selectors may be located at any suitable point,such, for example, as in the pent house or in the elevator shafts and,as illustrated, are simtilar to those usually employed in elevatorsystems.

As1sh own, the selector F5 for the car A is provided'with a set of upcontact segments and a set of down contact segments that are disposed tobe engaged by cooperating brushes 10 to'27, inclusive, mounted upon, andinsulated from, a movable arm MA;

. Tlie movable arm MA is operated in accordance with the movements ofthe car A by means of a screw AS that is driven by some part of theoperating mechanism of the car which the selector serves. f

Usuallmithe -frictional engagement between arm MA and its operatingscrew AS will cause the arm to bear upon the up contact segmentswherrthe 'car 'is travelling upwardly and upon the down contact segmentswhen the-car is travelling downwardly. However, in the present system,it isdesirable, to have the movable arm MA tilted to the opposite sideas soon as the "'car reaches the limit or its up and'down travel.

Therefore, the selector is provided'witha pair offelectromagnets 30 and31 that'may be energized to cause'the arm MA to tilt in the properdirection upon reaching the end of its travel. The 'electromagnets soand 31 may be energiz'ed to tilt the movable, arm MA when the car la"down*,"se1ector relay'33, which, in turn, are

' the brushes 1G,.Illand12 control the lighting of theup floor lanternsto indicate'to waiting controlledb'yf a air of limit switchest and. as.The] group oi. upf' contact segments under passengers that the car willstop for them. I

' g'roup" oi flip"v contactsegments under tons, and the group" of 'fup"contactfisegments undefthe'brushes l6, l'l'and 18 connect the carbuttons. with the floor, relays for stopping the GIG-r. Ir-". I all; ,1.I. s LAs shown, ,the brushes ;1o, 11' and12 for the upfloor-iantern'segmerit sare so disposed on the arm MA that thehigh-speed brush 10 "will engage the? 'fioor-lanternseghi'ent for afloor when, the, car is two floors away from that floor,

" the intermediate-speedbrush 11 will engage the segment ,when the caris one floor away and the brush 12 will be in engagement with thesegwant when the car is standing,-thus providing means whereby anenergized segment will keep a fioqr lantern lighted whtle a, cardecelerates from highspeed tb 'a stop at afioor and remains Theexpress-brush i s term "up?" floor-but ten segments is so disposedentire arm MA. that it. will engage the floor-button segment" for-Iacoir when thecar isapproidmately three floors from that floors, Theexpress brush 13 is connected inthecirouit ioi" the coil of the expresscontrol relay 6. Therefore, when the ex: press brush i3 'comesjintofengagement with a when segment that has energized bythe registration ofa stop call. it'wil1 energize the relay 6 tohopen the circuit tor theexpress relay 5.

line conductor L2;

the car to decelerate from its express speed to its normal-speed so thatit will be running at such speed; when .it picks up the registered stopcall, that it will be stopped exact-1y level with the floor for whichthe registered stop call exists. I'he brushes 14 and- 15 for the upfloor-button segments are disposed on the arm MA in such manner thatthe'high-speed brush 14 will engage thefloor-button segment fora floorwhen the car is approximately two floorsaway from that floor, andthe'standing brush 15 will be in-engagement with the segment when thecar is one floor away, thus providing separate circuits for operatingthe hi gh-speed fioor relay and the low-speedor standing floor relayassociated with the car B'is similar, inall respects, to that de-- 2D,3U, 3D and 8U and 8D instead oi toa sep-q arate set of'fioor pushbuttons; Therefore the push buttons 2U, 2D, 3U, 3D and 8U and 8D arecommon to both the cars A and B and the pressing of any one button willenergize the floor. 4 button contact segments of both cars to cause thefirst car to approach in a corresponding direction to stop at the floorat which the button I has been pressed. x

My, invention may behest understood from an assumed operation of theapparatus represented in the drawings.

[Assuming that the car B is standing at the upper landing; that the carA is standing at the first floor landing ready to start upwardly andthat a passenger waiting at the second floor presses the up" button 2Uto register a stop call that will cause a car to stop at the secondfloor, then the operation of the push button 2U closes a self holdingcircuit for itself that extends from the supply conductor Ll, throughconductor 40, the contact-members of button 2U, holding coil 41 and-conductorea to supply conductor L2.

Inasmuch as the car A is standing at the floor below'that door" at whichthe stop call exists, the'pressing oi the button 2U also completes a thecar to stop at the second floor, which circuit extends from supplyconductor L1, through eon ductor so, the contact members of push buttonj 2U, conductor e3, restoring coil 44, conductor 45, contact segment as,brush '15, conductors i7 and as, the contact members I of up-directionswitch 1,, conductor 49, thec'ontact members I of down-direction switch2, conductor-50, the

coil of relay-G2 and conductors 51 and 52,.to

circuit'ior energizing the floor relay G2 to cause The closing of thecontact members on the floor relay G2 completes a circuit for energizingthe control relay Co to thereby efiect the restoration of the pushbutton 2U, the lighting of the floor lantern L2U, and the energizationof the inductor relays to stop the car at the second floor, whichcircuit extends from line conductor L1, through conductors 55 and 56,

the contact members of stopping inductor relay S, conductors 57 and 58,the coil of relay Co, conductors 59 and 60, the contact members a ofrelay G2 and conductors 61, 62 and 52, to

v supply conductor L2.

The closing of the contact members a on the control relay Co completes aself-holding circuit for that relay which extends from the Supplyconductor L1, through conductor 55, as just described, to the coil, ofthe relay Co and thence, through the contact members a thereof andconductors 63 and 64, to supply conductor L2.

The closing of the contact members 0 on the control relay Co completes acircuit tor-fully energizing the restoring coil 44 to! restore the floorpush button 2U to its open position, which circuit extends from thesupply conductor L1, through conductor 40, the contact members of pushbutton 2U, conductor 43, restoring coil 44,

v on the push button 2U are wound in oppositionto each other so as tooppose each other magnetically. Therefore, when the restoring coil 44 isfully energized, it has sufficient magnetic force to neutralize themagnetic force of the holding coi1'4l, thereby causing it to release thepush button to its normal open position. Thus, the push button 2U willbe restored to its open position to make it ready for future operationand to prevent the registered stop call from being picked up by anyother car when full current is supplied to the restoring coil 44. Whenthe restoring coil 44 was in series with the coil of the floor' relayG2, during the energization of that relay, there was suflicientresistance in the coil of relay G2 to prevent the restoring coil 44 frombeing sufiiciently energized to magnetically overcome the holding coil41.

The floor relay G2 is deenergized when the contact members -on the pushbutton 2U are opened.

It should be noted here that the push button 2U is restored to its openposition as soon as the relays G2 and Co operate, because the car A isat the next floor below, with its car switch 05.4. in a centeredposition. If no car were standing atthe next floor below, the restoringcoil 44 would not be fully energized until a car came to, and stoppedat, the lower terminal. Hence, in the absence of a car at the lowerterminal, the push button 2U would have remained in its depressedposition until a car arrived, thus indicating to the waiting passenger,at the second'floorthat the stop calfwas registered.

The opening. of the contact members 9 on the control relay Co opens thecircuit to the coil of the high-speed relay 4 and thereby preventsthecar from running at high speed, so that it may 'makea one-floor run tothe second floor. Further explanation oi the operation of the controlrelay Co will be deferred until the starting of the car by the carattendant is described. I

Assuming now that the attendant on the car A decides to make an up run,under our assumed condition of operation, he will start the car from thefirst floor in the usual manner by operating the car switch CSA in aclockwise direction to full-speed position and then returning it to itscontrol position. v In the control system illustrated in the drawings,the attendant will normally throw the car switch all the way over to itshigh-speed position, hold it there for a short period to permit thevarious relays to pick up and then recenter it, so that the car will bestopped at any floor by its inductor relays when they are energized as aresult 01" the' operation of the push buttons at the floor landings orin the car. If the car switch is held in its high-speed position, theinductor relays cannot be energized, and the car 'will run through itsstop ca1ls.- I

The movement of the car switch CSA in the clockwise direction completesa circuit for energizing the up-direction switch 1 to start'the carupwardly, which circuit extends from supply conductor L1, throughconductors 55 and 56, the contact members of inductor relay S,conductors 57 and 68, the coil of rip-direction switch 1. conductor 69,the contact members 70, 71 and 72 of car switch CSA and conductors 73and 42, to supply conductor L2.

The closing of the contact members a on the up-direction switch 1completes a sell-holding circuit for that switch which extends fromsupply conductor L1 to the coil of up-direction switch 1, asjustdescribed, and thence through conductor 74, the contact members a ofup-direction switch 1 and conductors 75 and 76, to supply conductor L2.

The closing of the contact members b and c on theiup-direction switch 1energizes the field winding GF of the generator G with current in onedirection by way of a circuit that extends from supply conductor L1,through conductors 77 and 78, the contact members b of up-directionswitch 1, conductors 79 and 80, the field winding GF, conductors 81 and82, the contact members 0 of up-direction switch 1, conductors 83 and84, resistor sections r1, 1'2 and 1'3 and conductor 85, to supplyconductor L2.

The energization of the field winding GF causes the generator G tosupply current in one direction to the hoisting motor. EM, and the carstarts upwardly.

As the attendant continues the movement of the car switch CSA in aclockwise direction, a circuit is completed for energizing theintermediate-speed relay 3 for causing the car to operate at itsintermediate speed. which circuit extends from supply conductor L1,through conductors 55, 56 and 87, the contact members of inductor relaySD, conductor 88, the contact members of inductorgrelay SU, conductor89, the coil of high speed relay 3, conductors and 91, the contactmembers 92,. 71 and 72 of car switch CSA and conductors 73 and 42, tosupply conductor L2.,

The closing of the contact members a on th intermediate-speed relay 3completes a self-holdin'g circuit for that relay extending from supplyconductor L1 to the coil of relay 3, as Just described, and thence,through the contact memscl- ' through the contact members 9 on the floorcontered the car switch GSA, we will again take up ay. 3 W l b gized fOperating eta .the operations. effected by the energizing of the up ar ya intermediate p PTeVlOuBly the second floor, which circuit extends fromsupgized when the next stop is to be made.

section 13 from the circuit previously traced for the floor lanternL2U-to be lighted when the car the field winding GF to thereby cause thecar A was at the first floor and to'thereafter remain totravel at ahigher speed. lighted while the car ran to, and stopped at, the Thefinal movement of the car switch CSA to second floor. The floor lanternwill staylightits high-speed position closes its contact memed while thecar remains at the second floor, but hers for the high-speed relay4 but,inasmuch will be extinguished when the contact members as the circuitfor the relay 4 must be completed 101 and 72 on the car switch GSA areseparated by the operation-of that switch to start the car. trol relayCo, which are now open because that I Assumingnow that the waitingpassenger at relay is energized, the car will not get into high thesecond floor has boarded the car and that speed and will operate only atits intermediate the attendant again starts the car upwardly by Speed sothat it may be stopped at the second moving the car switch CSA- in aclockwise difloor by the inductor relays. rection toits lull-speedposition, then the nir- Assuming that the car attendanthasre-cendirection switch 1 and t e intermediate-speed control relay Co.

The closing of the contact members '1) on the Ina much as 110 t p callis r i ter d or excontrol relay Co completes a circuit for energiz istsfor the next fioor the Co ac mem r 0 ing the slow-down and stoppinginductor relays on the control relay Co are closed. Therefore, HU, SUand S on the car A to stop the car at when the car switch is moved toiuli-speed position, a circuit will also be completed for en plyconductor L1, through conductors 55 and 50, ergizing the high-spee-relay t o p a e the the coil of stopping relay S, conductors and car athigh speed, which circuit extends from 96, in parallel through the coilsSU and HU, supply Conductor L1, through conductors 55, 56100 conductor97, the contact members d of up-diand 115, the contact members ofinductor rerection switch 1, conductors 98 and 99, the conlay HD,conductor 116, the contact members of tact members b of relay Co,conductor 100, the indu tor Telay Conductor the 0011 of contact members101, 71 and '72 of car switch g -Sp d e a 0010111101301 118, e C CSA andconductors 73 and 42, to supply conmembers a of voltage relay '2,conductor 119, the ductor L2. 7 contact members g of control relay Co,conduc- The energization of the inductor relays SU to Contact members121} 71 and 72 of the and 3 causes them ,t be actuated to open their carswitch CSA 'and conductors 73 and 42 to contact members as they pass theinductor plates upp y Co ducto L2- so and s' and thereby open thecircuits for The closin o t Contact members a o the theintermediate-speed relay 3 and the up-direcp ed relay 4 Comp es aholding ci cu tion switch 1, thus deenergizing the relay 3 and for t atrela t nd m pp ondu t the lip-direction switch 1 and bringing the car L1to e coi o e a as J' described, a to a stop at the second floor. thence,through conductor 125, the contact The opening of the contact members onthe m mb s a f r ay 4, conductors 126, 93'a inductor relay S alsodeenergizes the control to pp y Conductor relay Co and renders it readyto be again enerdescribed.

The closing of the contact members I) on the high-speed relay 4 servesto shunt the resistor When the control relay Co was energized thesection 72 from the circuit previously traced for closing of its contactmembers f completed a h field Winding GF to thereby cause the to circuitfor lighting the floor lantern L2U at the t av at high p 4 seeond floorfor indicating to the waiting pas- Assuming n vtihat th d pa i a esenger at that floor that the car would stop of the ato st closes the pssp d thereat, which circuit extended from supply conswitch 9 to speedupt Operation of the & ductor L1, through conductors 5s and 105, lamp A sothat it will return to t terminates 80011 LZU, conductor 106, contact,segment 107, brush as p e, en the e press relay 5 w be 11, conductor.108, the contact members g of energized to operate the carat its expressspeed high-speed. relay 4, conductor 109, the contact y y Of a,0i!011itthat extends from pp members d of intermediate speed relay 3,conconductor L1, through conductor 55, the disductor 110, the contactmembers I of relay C0, p ng Switch 9, conductor 127, the coil ofreconductor 100, contact members 101, 71 and '72 y 5, 6011011101101 theContact members 0 Of or car switch csA and conductors 73 and 42, to r ay6, ondu 129, h C t members b supply, conductor L2. of voltage relay '7and conductor 94, to supply As the car A approached, and stopped at thesecond floor, the arm MA on the floor selector FS movedto such positionthat thestand- I ing brush 12 engaged the contact segment 107 and,therefore, the circuit for lighting the floor lantern L2U wastransferred from the lowspeed brush 11 to the standing brush 12, whichcircuit now extends from the supply conductor L1 to the contact segment107, as just described, and thence, through the brush 12, conductor 111,the normally closed contact members c of intermediate-speed relay 3,conductor 100, the contact members 101, Z1 and 72 of car switch CSA andconductors 73 and 42, to supply conductor L2.

Thus, the arrangement of the intermediatespeed brush 11 and the standingbrush 12 caused conductor L2.

The closing of the contact members on the express relay 5 servesto'shunt the resistor, section 11 from ,the circuit previously tracedfor the field winding GF, thereby allowing full line voltage to besupplied to the winding GF to cause the car to travel at full expressspeed.

Assuming now that a passenger waiting at the eighth floor landingpressed the up button 8U as the car A left the first floor to answer thesecond flcorcall and thereby registered a stop call for stopping a carat the eighth floor, then the pressing of the button 8U energized theholding coil 130 for maintaining the button 8U in a depressed positionby way or a circuit that extends from supply conductor L1, throughconductor 131, the contact members of button 8U,

maintain the button 8U in its depressed position to indicate to waitingpassengers at the eighth floor that the button has been operated andthat an up stop call at the eighth floor is registered.

The maintenance of the button 8U .in its pressed condition will alsocause current to be supplied to the contact segment 132 on the floorselector FS and to the contact segment 124 on the floor selector BFS forenergizing the high speed floor relay- R2 for the first car to ap proachthe eighth floor in the up direction in order to stop that car at theeighth floor. However, as before stated, car B is at the top landing andcar A is moving upwardly. Therefore, car A'will be the first car toapproach the registered call at the eighth floor and it will be stoppedat that floor. As the car A approaches the eighth floor stop at expressspeed, the movable arm MA on the floor selector FS will cause theexpress brush 13 to engage the energized contact segment 132 in advanceand thereby energize the express control relay 6 to decelerate the carfrom its express speed to its high speed by way of a circuit whichextends from supply conductor L1, through conductor 131, the

contact members of floor button 8U, restoringcoil 133, conductor 134,contact segment 132,

brush 13, conductor 135, the coil of relay 6, and

a of relay 5 to open and thus reinsert the resistor section T1 in thecircuit for the field winding GF of the generator G to thereby slow downthe car A to its normal high speed.

As the car A continues its approach to the eighth floor, the floorselector arm MA causes the high-speed brush 14 to engage the energizedcontact segment 132 and thereby complete a circuit for energizing thefloor relay R2 to stop the car A at the eighth floor, which circuitextends from supply conductor L1, through conductor- 131, the contactmembers of floor button 8U, the restoring coil 133, conductor 134,contact segment 132, brush 14, conductor 142, the coil of relay R2 andconductors 143 and 64, to supply conductor L2.

The closing of the contact members of the floor relay R2 completes acircuit for energizing the control relay Co, which circuit exten ds fromthe supply conductor L1, through conductors 55 and 56, the contactmembers of inductor relay S, conductors 57 and 58, the coil of relay Co,conductor 59, the contact members of relay R2 and conductors. 144, 145supply conductor L2.

The closing of the contact membeisa. of the relay Co completes aself-holding circuit for that relay extending from supply conductor L1to the coil of relay Co, as just described, and then, through thecontact members a of relay Co and conductors 63 and 64, to supplyconductor L2.

and 64, to 4 the holding coil 130' and conductor 42, to supply Theclosing of the contact members b on the control relay Co,completes acircuit for energizing the inductor relays HU, SU and S on the car A forstopping the car at the eighth floor, as previously described.

As the car passes the eighth floor inductor plate HU, the energizedinductor relay HU will be actuated to open its contact members andthereby open the holding circuit for the high-speed relay 4 toautomatically slow down the car to intermediate speed.

As the car continues toward the eighth-floor 'level, the energizedinductor relay SU passes the eighth-floor inductor plate SU' andisactuated to open its contact members to deenergize theintermediate-speed relay 3 for automatically bringing the car to a stilllower speed as it approaches the point at which the power should be shutofi.

As the car continues toward the eighth-floor level, the energizedstopping inductor relay S passes the inductor plate S and is actuatedthereby to open the circuit to the up-direction switch 1 fordeenergizing the generator winding GF and bringing the car to a stop atthe eighth floor. The opening of the contact members on the inductorrelay S also deenergizes the control relay Co.

The opening of the contact members on the stop inductor relay S alsodeenergizes the holding' circuit for the express control relay 6,thereby restoring that relay to its normal condition in which itscontact members a are closed to permit the express relay 5 to be againenergized.

When the control relay Co was energized as the car approached the eighthfloor, the closing of its contact members 0 restored the push button 8Uto its normal open position by completing a circuit in shunt with thefloor relay R2 to permit full current to be applied to the restoringcoil 133 and cause it to overcome the holding coil 130, which circuitextends from supply conductor L1, through conductor 131, the contactmembers of push button 8U, restoring coil 133, conductor 134, contactsegment 132, brush 14, conductors 142 and 137, the contact members I ofrelay 4, conductor 53, the'contact members 0- of relay C0, conductor100, the contact members 101, 71 and '72 of car switch CSA andconductors 73 and 42, to supply conductor L2.

The opening of the contact members on the restored push button 8U openedthe circuit for the energized floor relay R2 and restored that relay toits deenergized condition.

Atthe same time, the closing of the contact members f on the controlrelay Co completed a circuit for lighting the up-floor lamp L8U at theeighth floor to indicate to waiting passengers at that floor that thecar A would stop of high-speed relay 4, conductor 109, the contactmembers (I of relay 3, conductor 110, the contact member 1 of relay Co,conductor 100, the contact members 101, 71 and '72 of car switch CSA andconductors '73 and 42, to supply conductor L2.

As the car continues toward the eighth-floor stop, the arm MA movesalong the floor selector until the intermediate-speed brush 11 engagesthe contact segment 149, thereby causing the circuit for lighting of thefloor lantern LHU to be transferred from brush 10 to brush 11, whichiii) circuit now extends-from supply conductor L1 to the contact segment149, as just described, and then, through brush 11, conductor 108, thenormally closed contact members g of. relay 4,

5 conductor 109, the contact members d ofrelay 3,

conductor 110, the contact members I ofxrelay Co, conductor 100, thecontact members, 101,571, and 72 ofcar switch CSA and conductors 73 ands2, to supply conductor L2.. y,

As the car comes to rest at the eighth-floor landinglthe arm MA on thefloor selector FS metres to such position that the standing brush 12 isdisposedon the ,contact segment 149. Therefore, the circuit for lightingthe floor lantern L811 is transferred from intermediate speed brush 11to the standing brush 12, which circuit now extends from the supplyconductor L1 to the contact segment 1&9, as previously described, andthen, through brush 12, conductor 11-1, the contact members 2 of relay3, conductor 100, the contact members 101, 71 and 72 oi car switch CSAand conductors 73 and 42, to supply conductor 12. v 1 Thus, thearrangement of the high-spec i h 10, the intermediate-speed brush 11, a.3, me standing brush 12 causestlie floor lantern liilU to' be lightedwhenthe. car A begins to maize the stop at theeighth door, that is,comes into the stopping zone for the eighth floor and to thereafter"remain lighted while the car slows.

down and while it stops at that. door. The floor lantern'LBU will beextinguished by the separa= tion of the contact members'lol and 72 onthe car switch CSA when the switch moved to start the car.

Assume now that the car A completes its stop at the eighth floor andthat the attendant again moves the car switch USA in a clockwisedirection, then the urn-direction switch 1 will be energized, aspreviously described, and the car will start and move tothe upperterminal floor. As the car A'arrives atthe end of tits up run and isbrought to a stop by the usual terminal switches (not shown), the cammember 151 on the upper left-hand corner. of the car A opens the limitswitch 34 to deenergize-the up selector relay 32 and energize-the downselector relay 33 for causing the movable arm -MA to be-tilted over sothat it bears upon the" down contact sege The circuit, completed by the"closingnon the contact members .a on thaselector relay 32 forenergizing the selector relay '33, extends iii-om supply conductor L1,through conductor 152, the

' coil of relay 33,'conductor 154, the contact Klein-=- 'fi relay 33completes a circuit for energizing the electric-magnet 31 to tilt thearm MA until it ,rests upon the down contact segments, which circuitextends .from' supply conductor L1,

throughconductors 152,157, and 158, the contact members 17 on relay '33,conductor, 159, the

coil'of electromagnetdl and conductors 160 and 162 to supply conductorL2. i

Assuming now that the car A has taken on a number of passengers attheupper terminal and is ready to start down opdthat the car ,.attenclantmoves the car: switch CSA in a countenclockwise direction, then acircuit is completed, for energizing the down-direction switch 2 tostart the car downwardly, which circuit extends from supply conductorL1, through conductors, and, 56, the contact members of stoppingii -1'ductor relay S, conductors 57 and 165,- the coil of relay 2, conductors166 and 167, the contact members 168, 71 and 169 on the car switch CSAand-conductors 73 and 42,110 supply conductor The closing of the contactmember a on the down-direction switch 2 completes a self-hold ingcircuit for that switch, extending from supply conductor Ll, through thecoil of down-direction switch 2, as just described, and thence,

through conductor 166,- the contact members at of directionswitch 2 andconductors 170 and 76, to supply conductor L2.

The closing of the contact members b and c on the down-direction switch2 energizes the field winding GF of the generator G with current in thereverse direction by way of a cir-- cult that extends from supplyconductor L1, through conductors 77, 78, and 175, the contact members bon down-direction switch 2, conductor 81, the winding GF, conductors 80and 176, the contact members 0 of down-direction switch 2, conductors177 and 83, the resistor sections r1, T2, and T3 and conductor 85, tosup ply line L2.

The energization of the field winding GF causes the generator G tosupply current in the reverse direction to the hoisting motor EM, andthe cars starts downward.

As the attendant continues the movement of the car switch USA in acounter-clockwise direction, a circuit is completed for energizing theintermediate-speed relay 3 to cause the car -to operate at itsintermediate speed, which circuit extends from supply conductor L1,through condoctors 55 and 56, the contact members of inductor relay SD,conductor 88, the contact members of inductorrelay SU, conductor 89, thecoil of relay 3, conductor 90, contact members 180, l

The closing of the contact member a on the intermediate-speed. relay 3completes a selfholding circuit for that relay which extends from supplyconductor L1 to the coil of relay 3, as just-described, and thence,through the con,- tact members a of relay 3 and conductors 93 and 94, tosupply conductor L2.

The closing of thecontact members b on the intermediate-speed relay 3.shunts the resistor section r3 from the circuit of the field windingCi-F, as just described, therebypausing the car A to travel at itsintermediate speed.

Assuming that the attendant desires to cause thecar to travel at a stillgreater speed, he

moves. the car switch CSA further in its counterclockwise direction,then a circuit for energizing the high-speed relay 4 to cause the car totravel at its high speed will be completed from supply conductor L1,through conductors 55, 56 and 115, the contact members of inductor relayl-ID, conductor 116, the contact member of in ductor relay HU, conductor117, the coil of high speed relay a, conductor 118, the contact mem bersa of voltage relay 7, the conductor 119, the

contact members 9 of the control relay Co, conductors 1'20 and 181,v thecontact members 182, 71 and 169 of car switch CSA and conductors 73' and42,.tosupp1y conductor L2.

6 contact members a of relay 4 and conductors 126, 93 and 94, to supplyconductor L2.

The closing of the contact member b on the high-speed relay 4 shunts theresistor section r2 from the circuit of the field winding GF, aspreviously described, thereby causing the car to travel at an increasedspeed.

Inasmuch as 'the dispatcher has not 'yet opened the express-speed switch9, the car is still conditioned to operate at express speed. -Therefore,as soon as the generator G reaches a predetermined speed, the voltagerelay 7 will close its contact members I) to complete the hereinbeforedescribed circuit for energizing the express speed relay 5.Consequently, that relaycloses its contact members, thereby. shuntingthe resistor section 1'1 from the circuit of the field winding GF, aspreviously described, and causing the car to travel downwardly atexpress speed.

Assuming further that some of the passengers taken on at the upperterminal called out stops for the third and second floors and that theattendant pressed the push buttons A3 and A2 to register the stopsindicated by the passengers so that the car will be automaticallystopped at those floors, then circuits have been partially prepared forenergizing the floor relays R1 and G1 to eflect the stopping of the carat the third and second floors, which circuits will be completedwhen thecar enters the decelerating zones for the landings and causes thebrushes and contact segmentson the floor selector to complete theprepared circuits.

The pressing of the button A3 completed a self-holding circuit for thatbutton extending from supply conductor L1, through conductors 55, 185and 186, the contact members of button .A3, holding coil 187andconductors 188 and 42,

to supply conductor L2. The closed condition of the button A3 suppliesenergy to the contact segment 190 on the floor selector for stopping thecar and, at the same time, indicates to the car attendant that a callhas been registered to stop the car at the third floor.

As the car A approaches, at express speed, the down stop at the thirdfloor, it will be decelerated from the express speed to its low speedbecause the arm MA on the floor selector will cause the express brush 21to engage the energized contact segment 190 and thereby en- D relay, ashereinbefore described.

The opening of the normally closed contact members a on the relay 6deenergizes express relay 5 and causes the car A to decelerate fromexpress speed to its high speed.

As the car A continued its approach to the down stop at the third floor,the high-speed brush 20 engages the energized contact segment 190 on thefloor selector, and thereby completes the circuit partially prepared bythe operation of the push button A3 for operating the floor relay R1 toeffect the stoppingof the car at the third floor, which circuit extendsfrom supply conductor L1, through conductors 55, 185 and 186, thecontact members of push button A3, conductor 191, restoring coil 192,conductor 193, contact segment 190, brush 20, conductors 195,

196, the coil of floor relay R1 and conductors 197 and 64, to the supplyconductor L2.

The closing of the contact members on the floor relay R1 completes acircuit'for energizing the control relay Co, which circuit extends fromsupply conductor L1 through conductors and 56, the contact members ofinductor relay .S, conductors 57 and 58, the coil of relay Co, conductor59, the contact members of relay R1 and conductors 198, 145 and 64, tosupply conductor L2.

The closing of the contact members a on relay Co completes aself-holding circuit for that relay which extends from the supplyconductor L1 to the coil of relay Co, as just described, and.

thence, through the. contact members a of relay Co and conductors 63 and64, to supply conductor L2. 9

The closing of the contact members hen the relay Co completes a circuitfor energizing the inductor relays HD, SD, and S, so that they will beactuated by the inductor plates HD, SD and S to bring the car to a stopat the third floor landing, which circuit extends from supply conductorL1, through conductors 55 and 56, the

coil of inductor relay S, conductors and 200,

in parallel through the inductors HD and SD HD, SD, and S for the thirdfloor and thereby open the circuits for high-speed relay 4, inter-'mediate-speed relay 3 andthe down-direction switch 2, thus deenergizingthe high-speed relay 4, the intermediate speed relay 3, and.downdirection switch 2, and bringing the car to a stop at the thirdfloor.

At the time the control relay Co was energized, it closed itscontactmembers d to complete a circuit for causing the car button -A3 tobe restored to its normal open position, which circuit extends fromsupply conductor L1, through conductors 55, 185 and 186, the contactmembers of button A3, conductor 191, restoring coil 192, conductor 193,contact segment 190, high-speed brush 20, conductors 195, 196 and 202,the contact members 11 of relay 4, conductor 203, the contact members dof relay Co, conductor 100, contact members 101 '71 and 169 of carswitch CSA and conductors 73 and 42, to supply conductor L2.

It will be noted that this circuit is a shunt circuit around the coil ofthe. floor relay R1. Therefore, full voltage is supplied to therestoring cell 192 and it overcomes the holding coil 187, thus restoringthe .push button A3 to its normal open position. The opening of thecontact membe of the. push button A3 deenergizes thefloorre yRlandrestoresit.

At the same time, the energization of the conm1 relay Co closed itscontact members e which ing passengers that the car A would stop at thatfloor, which circuit extends. from supply conductor L1, throughconductors 55 and 105, floor lantern L3D, conductor 204, contact segment205, brush 27, conductor 206, the contact member J of high-speedrelay'4, conductor 207, the

contact members j of relay 3, conductor 208,

the contact members e of relay Co, conductor 100, the contact members169, 71 and 101 of car switch CSA and conductors 73 and 42, to supplyconductor L2.

As the car continues toward the third door,

the floor selector arm MA moves downwardly.

until the low-speed brush 26 engages the contact segment 205and therebycauses the fighting of the floor lantern L3!) to be transferred frombrush 27 to brush 26 by way of a circuit that extends irom the supplyconductor L1 to the contact segment 205, as just described, and then,

through'brush .26, conductor 209, the normally closed contact-members iof high-speed relay 4, conductor 207, the contact members 1' ofintermediate-speed relay 3, conductor 208, the contact members e ofrelay Co, conductor 100, contact numbers 101, 71 and 169 of car switchCSA and conductors '73 and 42, to supply conductor L2.

As the car comes to rest at the third floor landing, the arm MA bn thefloor selector moves to such position that the standing brush 25 isdisposed on the contact segment 205, thus transferring the circuit forlighting the floor lantern MD from the low-speed brush 26 to thestanding brush 25, which circuit now extends from thexsupply' conductorL1 to the contact segment 205955 just described, and. then, throughbrush 25, conductor 210, the normally closed contact members c of relay3, conductor 100, the contact members 101, 71 and 169 of car switch CSAand conductors '73 and 42, to supply conductor L2..

Thus, the arrangement of' the high-speed brush 27, theintermediate-speed'brush 26 and the standing brush 25 causes the downfloor lantern L31) to be lighted when the car A prepares to stop at thethird floor and to thereafter remain lighted while the car slows down,and while it stops at that floor.

Amuming now that the stop at the third floor is completed, and,recalling that-the car attendant pressed the car button A2 to cause-thecar to stop atthe second floor on its down trip, then the pressing ofthe button A2 completed a'seliholding circuit for that button extendingfrom supply conductor L1, through conductors 55, 185 and 212, thecontact members or button A2,

holding coil 213 and conductors 188 and 42, to

supply conductor L2.

Inasmuch as the button A2 has been operated for a down stopat the secondfloor, the standing of the car at thethird floor will cause a circuit tobe completed for energizing the floor relay G1 to cause the car to stopat the second floor, which circuit extends from Supp conductor L1,

through conductors 55, 185 and 212, thecontact ously described.

The closing of the contact members on the floor relay G1 completes acircuit for energizing the control relay Co, which circuit extendstrom30, conductors 59 and 60', the contact members of relay G1 andconductors 223, 82 and 52, to supply conductor L2.

The closing of the contact members a on the control relayCo completes aself-holding circuit for that relay which extends, as just described,from the supply conductor L1 to the coil of relay Co, and thence,through the contact members a of relay Co and conductors 63 and 64, tosupp conductor L2.

The closing of the contact members (1 on the relay Co completes acircuit for supplying full voltage to the restoring coil 214-to cause itto overcome the holding coil 213 and release the push button A2 to itsopen position, which cir- 'cuit extends from supply conductor L1,through conductors 55, 185 and 212, the contact members of button A2,conductor 225, restoring coil 214, conductor 215, contact segment 216,brush 19,

' conductors 217 and 218, the contact members 0 of high-speed relay 4,conductor 203, the contact members-d of relay Co, conductor 100, thecontact members 101, '11 and 169 of car switch-GSA and conductors 73 and42, to supply conductor The movement of the push button A2 to its openposition, opens its contact members, thereby deenergizing the floorrelay G1.

The closing of the contact members e on the control relay Co completes acircuit for lighting the down floor lantern. L2D, in a manner previ- Theclosing of the contact members b on the control relay Co completes a,circuit for energizing the inductor relays, as previously described.

-The opening of the-contact members 9 on the control relay Co opens thecircuit for the highspeed relay 4 and prevents the operation of the carat high speed, thus providing a means whereby the car A will run atintermediate speed upon being'started from the third floor and make aone-floor run to the stop at the second floor.

Assuming now that the car attendant .operates the car switch CSA in acounter-clockwise direction to its full running position in the usualmanner after the stop at the third floor is com pleted, then thedown-direction switch 2 and the intermediate speed relay 3 will beenergized as previously described, and the car will make a one-floor runto and stop at the second floor.

Afte'r the stop at the second floor is completed,

the operation of the car may be continued heretofore as described.

Thus, it will be seen that I have provided an elevator-controhsystm thatserves to indicate the registered condition of the control push buttonsassociated therewith, and which provides for restoring the push'buttonsto their normal open position as soon as the elevator car begins toanswer a stop call set up by the buttons. It will also be noted that mycontrol system requires a small number of parts and a minimum amount ofwiring, as compared with the usual elevator-control systems.

While I have illustrated and described only one specific embodiment ofmy invention, I realize that it is susceptible of many -modiiications,

therefore, I do not desire to be limited to the precise construction andarrangement 01' parts illustrated and described, except as defined inthe appended claims.

I claim'as my invention:

1, In a control system for an elevator car operable past a landing,means for stopping the car at said landing, a control circuit forconnecting said stopping means to a source of power, a pushbutton switchfor partially closing said control circuit, a holding coil formaintaining said switch in a closed position, a circuit disposed to becompleted by the closing of said switch for energizing said holdingcoil, means operably responsive to movement of the car for completingthe closure of said control circuit, and means operably responsive tothe operation of said stopping means'for causing said holding coil torelease said switch, X

2. In a control system for an elevator caroperable past a landing, meansfor stopping the car at said landing, control circuit for connectingsaid stopping means to a source of power, a pusl1=-button switch forpartially closing said control circuit, a holding coil for maintainingsaid switch in a closed position pending complete closure of saidcontrol circuit, a circuit disposed to be completed by the closing ofsaid switch for energizing said holding coil, means operably responsiveto movement of the car for completing the closure of said controlcircuit, a restoring coil for causing said holding coil to release saidswitch and means operably responsive to operation of said stopping meansfor energizing said restoring coil,

3, In a. control system for an elevator car Operable past a landing,means for stopping the car atsaid landing, a control circuit forconnecting said stopping means to a source of power, a push-buttonswitch for partially closing said control circuit, a holding coil formaintaining said switch in a closed position pending complete closure ofsaid contilol circuit, a circuit disposed to be completed by the"closing of said switch for energizing said holding coil, means operablyresponsive to movement of the car for completin; the closure of saidcontrol circuit, a restorin: coil associated with, and wound inopposition to, said holding coil for causing said holdlng coil torelease said switch, and means operably responsive to operation of saidstopping means for energizing said restoring coil.

4, In a control system for an elevator car oparable past a landing,means for stopping the car atsaid landing, a control circuit forcon'nect-, lng said stopping means to a source of power,

control circuit. a holding coil for maintaining said switch in a closedposition pending complete closure of said control circuit, a circuitdisoperably responsive to movement of the car for completing the closureof said control circuit, a restoring coil disposed in series with saidstopping means in said control circuit, a secondary circuit disposed inshunt relationto said control circuit. and means for closing saidsecondary circult to shunt said stopping means and thereby energize saidrestoring coil sufiiciently to cause said holding coil to release saidswitch.

ing said switch in a closed position pending complete closure of saidcontrol circuit, a circuit disposed to be completed by the closing ofsaid switch for energizing said holding coil,

means operably. responsive to movement'of the car for completing theclosure of said control circuit, a restoring coil disposed in. serieswith said stopping means in said control circuit, a secondary circuitdisposed in shunt relation to said stopping means, and means operablyresponsive to the operation of said stopping means for closing saidsecondary circuit to shunt said stopping means and thereby energize saidrestoring coil sufiiciently to cause said holding coil switclrforenergizing said holding coil, means operably responsive tomovement ofthe car for completing the closure of said control circuit, a restoringcoil wound in opposition to said holding coil and disposed in serieswith said stopping means in said control circuit, a secondary circuitdisposed in shunt relation .to said stopping means, and means operablyresponsive to operation of said-canstopping means to stop said car forclosing said secondary circuit to shunt said stopping means and therebyenergize the restoring coil sufficiently to cause said holding coil to Irelease said switch.

7. In a control system for an elevator car opof an attendant on saidcar-for starting said car, means for stopping the car at said landing, acontrol circuit for connecting said stopping means to a source of power,a push-button switch for partially closing said control circuit, aholding coil for maintaining said switch in a closed position pendingcomplete closure of said control circuit, a, circuit disposed to becompleted by the closing of said switch for energizing said holdingcoil, means operably respon- Give to movement of the car for completingthe closure of said control circuit, a restoring coil in opposition tosaid releasing coil and in series with said stopping means in saidcontrol cirwait, a shunt circuit around said stopping means, ,apush-button switch for partially closing said and means operablyresponsive to operation of said stopping-means for completing said shuntcircuit, said restoring coil to beso proportioned with reference to saidholding coil as to remain posed to be completedby the closing of said'switch for energizing said holding coil, meansineffective while inseries with the stopping means and to overcome the holding coil andcause it to release said switch when the shunt circuit is completed.

8. In a control system for, a plurality of elevator cars operable'past alanding, means associated with each car for stopping that car at saidlanding, a control circuit for connecting the stopping means for eachcar to a source of power, a push-button switch for partially closingsaid erable pasta landing, means under the control v control circuit, aholding coil for maintaining said switch in a closed position, a circuitdisposed to be completed by the closing of said switch for energizingsaid holding coil, means associated with each car and operablyresponsive to its movement for completing said control circuit toenergize the stopping means on that car. and

means "operably responsive to the operation of the stopping means on thefirst car to stop at said landing in response to the operation or saidpush-button switch, for causing said holding coil to release saidswitch.

9. A control system for an elevator car com-- prising stopping switchmechanism, contactors controllable manually, oppositely wound windingsoperatively associated with said contactors, one to maintain them inactuated position and the other to neutralize the action of themaintaining winding to return said contactors to normal position, anenergizing circuit for said other winding comprising contactorscontrollable by the car and additional contactors in series therewith,closed only after actuation of said stopping switch mechanism to rendersaid other'winding effective. Y

10. A control system for an elevator car comprising contactors for eachof a plurality of landings controllable manually therefrom, oppositelywound windings operatively associated with the contactors for each ofsaid landings, one oi? which maintains its contactors in actuatedposition, and the other of which is provided with a circuit controllableby the car and is efiective when energized to neutralize the action orthe maintaining winding to cause its contactors to return to normalposition.

a '11. A control system for an elevator car comprising up and down floorswitches for each of a plurality of landings, each having oppositelywound windings, one of the windings of any of said switches energizableat anytime regardless of the position of the car'and the direction ofmovement of the car, and means to successively energize the otherwindings of said up switches when the directionof car movement isupwardly but not when it is downwardly, and means to successivelyenergize the other windings of said down switches when the direction ofcar movement is downwardly but not when it is upwardly.

12. A control system for an elevator car comprising a floor switch foreach oi. a plurality of landings, each having a maintaining winding anda self-holding circuit therefor, and an'additional winding to oppose themagnetic effect of the maintaining winding to re-set its switch, carcontrolled mechanism to control circuits for said additional windings,and circuits responsive to said floor switches to control the car.

WILLIAM F. EAMES.

